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microblaze: Support word copying in copy_tofrom_user

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Word copying is used only for aligned addresses.
Here is space for improving to use any better copying technique.
Look at memcpy implementation.

Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2010-03-22 20:31:26 +01:00
parent 6059b3cbeb
commit ca3865bae5
1 changed files with 25 additions and 14 deletions
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39
arch/microblaze/lib/uaccess_old.S
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@ -53,7 +53,6 @@ __strncpy_user:
nop
.size __strncpy_user, . - __strncpy_user
.section .fixup, "ax"
.align 2
4:
@ -95,7 +94,6 @@ __strnlen_user:
nop
.size __strnlen_user, . - __strnlen_user
.section .fixup,"ax"
4:
brid 3b
@ -121,21 +119,34 @@ __copy_tofrom_user:
* r7, r3 - count
* r4 - tempval
*/
addik r3,r7,0
beqi r3,3f
1:
lbu r4,r6,r0
addik r6,r6,1
2:
sb r4,r5,r0
addik r3,r3,-1
bneid r3,1b
addik r5,r5,1 /* delay slot */
beqid r7, 3f /* zero size is not likely */
andi r3, r7, 0x3 /* filter add count */
bneid r3, 4f /* if is odd value then byte copying */
or r3, r5, r6 /* find if is any to/from unaligned */
andi r3, r3, 0x3 /* mask unaligned */
bneid r3, 1f /* it is unaligned -> then jump */
or r3, r0, r0
/* at least one 4 byte copy */
5: lw r4, r6, r3
6: sw r4, r5, r3
addik r7, r7, -4
bneid r7, 5b
addik r3, r3, 4
addik r3, r7, 0
rtsd r15, 8
nop
4: or r3, r0, r0
1: lbu r4,r6,r3
2: sb r4,r5,r3
addik r7,r7,-1
bneid r7,1b
addik r3,r3,1 /* delay slot */
3:
addik r3,r7,0
rtsd r15,8
nop
.size __copy_tofrom_user, . - __copy_tofrom_user
.section __ex_table,"a"
.word 1b,3b,2b,3b
.word 1b,3b,2b,3b,5b,3b,6b,3b